Stupid dealer rant

[jasonstang]

My sensors read exactly what the tire pressures are. Verified with a very accurate, liquid filled gauge.

Unless both of my gauges are bad, the dash on mine reads about 1-2 psi higher.

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[brandonsmash]

Thanks that was what was throwing me. My 2016 GT isn't here yet and I didn't know the recommended pressure. My 2013 Cadillac calls for 40 psi so wasn't getting the point.

Yep. The doorsill recommends 32 psi.
That's where I keep mine, and I'm happy with it.

 

[HoosierDaddy]

Yep. The doorsill recommends 32 psi.

I'm a little surprised they call for that low. Higher pressure results in less sidewall flex and better turn-in. Is 32 the recommended pressure for PP cars?

Never mind, I see you have a PP.

 

[Sheenapple]

I do 34 rears, 33 fronts

 

[kn7671]

I do 34 rears, 33 fronts

The rears should almost always be lower to the fronts, as you want the rear tires to lay flatter on the road for better grip, plus they don't need to cope with the increased sidewall load and wheel angle to direction of movement.

Running high rear tire pressures on a rear-wheel-drive car will lead to increased tire wear down the middle.

 

[CB]

The pressures in the first post picture are what my car came with.

 

[kn7671]

Unless both of my gauges are bad, the dash on mine reads about 1-2 psi higher.

Most tire pressure gauges have a +/- 1psi accuracy, though I believe the TPMS sensors have a tighter tolerance of 0.5psi, so it is entirely possible that your tire pressure gauge vs the TPMS sensors varies 1-2psi.

I have had 4 different sets of wheels/tires with new TPMS sensors in each set, and every set of TPMS sensors read identically on the dash after setting the pressure externally to my tire pressure gauge. In short, the tolerance of the TPMS sensors must be pretty good to always have 4 tires showing the same pressure immediately following setting them on my gauge, but they never match my Tire Pressure Gauge.

As for Tire pressure gauges, I've got 4-different digital tire pressure gauges and 1-manual tire pressure gauge, and not a single one agree on a tire pressure reading between them, and none exactly match what the TPMS sensors are reading and displaying on the dash. Out of 5-tire pressure gauges, I have one that reads 1psi lower than TPMS value, and another that is 1psi higher, while the other three are +/- 3 to 6psi TPMS values.

 

[wilkinda65]

My LE brand new had the same high tire pressure when it rolled off the truck. The dealer during the PDI lowered them to Ford recommended. Is it possible Ford does this from the factory due to cars sitting before transport, during transport?

 

[Higgs Boson]

Most tire pressure gauges have a +/- 1psi accuracy, though I believe the TPMS sensors have a tighter tolerance of 0.5psi, so it is entirely possible that your tire pressure gauge vs the TPMS sensors varies 1-2psi.

I have had 4 different sets of wheels/tires with new TPMS sensors in each set, and every set of TPMS sensors read identically on the dash after setting the pressure externally to my tire pressure gauge. In short, the tolerance of the TPMS sensors must be pretty good to always have 4 tires showing the same pressure immediately following setting them on my gauge, but they never match my Tire Pressure Gauge.

As for Tire pressure gauges, I've got 4-different digital tire pressure gauges and 1-manual tire pressure gauge, and not a single one agree on a tire pressure reading between them, and none exactly match what the TPMS sensors are reading and displaying on the dash. Out of 5-tire pressure gauges, I have one that reads 1psi lower than TPMS value, and another that is 1psi higher, while the other three are +/- 3 to 6psi TPMS values.

I have a calibrated gauge that was like 200 dollars (ripoff) and the mustang tpms does indeed read about 2 psi higher. I checked it this morning after reading that post, kind of interesting.

 

[kn7671]

My LE brand new had the same high tire pressure when it rolled off the truck. The dealer during the PDI lowered them to Ford recommended. Is it possible Ford does this from the factory due to cars sitting before transport, during transport?

It helps keep the tires from getting sidewall cracks and flat spots if the tires sits stationary for too long, in addition to compensating for natural tire pressure loss. This is one reason some manufacturers use high content Nitrogen fills from the factory, as it allows the tire pressure to remain stable for longer periods since Nitrogen does not seep out of the tire as quickly as the standard mix of Carbon Dioxide, Nitrogen, Argon, and Oxygen.

If you fill you tires at home, but sure you have a water separator on your air outlet, as you don't want to continually add water vapor into your tires.

 

[kn7671]

Good Tire Pressure Reference article over on Tire Rack . com

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=191

 

[sonic]

Recommended pressures are on the b pillar and are 36psi being that your in AZ where you can fry an egg on any road the pressure will go up a few PSI I don't see where the dealer did you wrong

 

[plc268]

No one ever seems to mention this, but this stick on my door jamb seems to indicate 36 psi if you do any sort of fast/hard driving.

 

[ForTehNguyen]

correctly filled 32 psi tires get to about 35 psi when warm. Not 40-41

 

[GoBlues38]

most tires are recommended from 34-40psi.

I don't see a problem.

The stang specifically calls out for 32 PSI. To put 41 psi is just stupid.

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